Question

Which of the following will end with the digit 1?

• A. ${49}^2$
• B. ${33}^2$
• C. ${47}^2$
• D. ${98}^2$

Answer 1

The correct option is A ${49}^2$

This depends on the number at the unit place.
For example, the unit digit of the number 47, is 7, and the square of 7 is 49. Similarly, the unit digit for the square of number 47 is 9.

Therefore, 49 is the correct option as the number created by the square of 49 has 1 as the unit digit.